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A method of braking an actuator piston, and a pneumatic actuator

An actuator piston, actuator technology, applied to non-mechanically actuated valves, engine components, machines/engines, etc., to solve problems such as functional damage, valve seat damage, etc.

Inactive Publication Date: 2009-03-11
CARGINE ENG AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A possible problem is that the valve will hit the valve seat at a high speed, whereby the valve and / or the valve seat will risk being destroyed, or the function will be impaired

Method used

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  • A method of braking an actuator piston, and a pneumatic actuator
  • A method of braking an actuator piston, and a pneumatic actuator
  • A method of braking an actuator piston, and a pneumatic actuator

Examples

Experimental program
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Effect test

Embodiment Construction

[0033] figure 1 A part of an internal combustion engine according to the invention is shown schematically. An internal combustion engine includes: a cylinder 1 ; a piston 2 reciprocally provided in the cylinder; a combustion chamber 3 defined by the cylinder and the piston; an intake valve 4 ; and an exhaust valve 5 . An exhaust system or the like may be connected to the exhaust port provided with the exhaust valve 5 .

[0034] figure 1 In the process, the piston 2 is in motion during the compression stroke of the two-stroke cycle, or during the intake stroke of the four-stroke cycle, air can flow into the combustion chamber through the open intake valve 4 together with fuel.

[0035] The internal combustion engine comprises a pneumatic actuator forming a valve actuator 6 for operating the valves 4 , 5 . The valve actuators 6 are connected to, or comprise, a pressure fluid circuit 7 and comprise actuator cylinders 8, 9 associated with the respective valves 4, 5 and provided...

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PUM

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Abstract

A pneumatic actuator, connected to a pressure fluid circuit (6) that has a high pressure side and a low pressure side, an actuator cylinder (8, 9), an actuator piston (10, 11) provided in said actuator cylinder (8, 9) and displaceable between a first position and a second position, an actuator chamber (12, 13), delimited by said actuator cylinder (8, 9) and the actuator piston (10, 11), wherein the volume of said actuator chamber decreases upon a displacement of the actuator piston (10, 11) from the second to the first position to the first position, a spring means provided to drive the actuator piston (10, 11) from the second position to the first position, and means (25) provided to maintain or establish a communication between the low pressure side and the actuator chamber (12, 13), during a displacement of the actuator piston (10, 11) from the second position towards the first position, and at the same time to keep the communication between the high pressure side and the actuator chamber (12, 13) interrupted. The pneumatic actuator comprises means (25) provided to interrupt said communication between the low pressure side and the actuator chamber (12, 13) before the actuator piston (10, 11) reaches the first position.

Description

technical field [0001] The invention relates to a method of braking an actuator piston of a pneumatic actuator connected to a pressure fluid circuit comprising a high pressure side and a low pressure side, the actuator comprising: a cylinder; an actuator piston disposed in the actuator cylinder and movable between a first position and a second position; an actuator chamber composed of the actuator cylinder and the actuator piston Defined, wherein, when the actuator piston moves from the second position to the first position, the volume of the actuator chamber decreases; and spring means, arranged to move the actuator piston from the second position to the first position One-position actuation wherein, during movement of the actuator piston from the second position toward the first position, communication is established or maintained between the low-pressure side and the actuator chamber, while communication between the high-pressure side and the actuator chamber connection is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L9/02F01L1/16F01L9/16
CPCF01L1/16F01L9/026F01L9/16
Inventor M·赫德曼A·赫格隆德
Owner CARGINE ENG AB